Discrepancies in anthropometric parameters between different models affect intervertebral rotations when loading finite element models with muscle forces from inverse static analyses
Discrepancies in anthropometric parameters between different models affect intervertebral rotations when loading finite element models with muscle forces from inverse static analyses
复制标题
当使用逆静态分析的肌肉力加载有限元模型时，不同模型之间的人体测量参数差异会影响椎间旋转
DOI：
10.1515/bmt-2013-0121
复制
发表时间：
2014-06-01
影响因子：
1.7
通讯作者：
Rohlmann, Antonius
中科院分区：
文献类型：
--
作者：
Zhu, Rui;Rohlmann, Antonius
摘要：只有少数已发表的有限元 (FE) 模拟将肌肉力施加到脊柱上。最近，使用脊柱逆静态 (IS) 模型确定的肌肉力被转移到脊柱 FE 模型，并研究了系统参数的影响。然而，没有考虑 FE 和 IS 模型之间人体测量差异的敏感性，例如身高和脊柱方向。这项敏感性研究的目的是确定肌肉力量从 IS 模型转移到 FE 模型后这些差异对椎间旋转 (IVR) 的影响。使用反向静态肌肉骨骼模型估算上半身 20° 屈曲和 10° 伸展时的肌肉力。这些力随后被转移到脊柱-骨盆复合体的非线性有限元模型中，其中包括 243 个肌束。故意产生两个模型之间的身高偏差（±10厘米）、矢状面脊柱方向（±10°）和体重偏差（±10公斤），并确定它们对IVR的影响。计算各因素相对于IS模型相应参考值的变化。相对于 T12-S1 IVR，身高、脊柱方向和体重的偏差导致 IVR 的最大变化分别为 19.2%、26% 和 4.2%。将肌肉力从 IS 模型转移到 FE 模型时，两个模型具有相同的脊柱方向和高度至关重要。此外，两种型号的体重应该相同。
Abstract In only a few published finite element (FE) simulations have muscle forces been applied to the spine. Recently, muscle forces determined using an inverse static (IS) model of the spine were transferred to a spinal FE model, and the effect of methodical parameters was investigated. However, the sensitivity of anthropometric differences between FE and IS models, such as body height and spinal orientation, was not considered. The aim of this sensitivity study was to determine the influence of those differences on the intervertebral rotations (IVRs) following the transfer of muscle forces from an IS model to a FE model. Muscle forces were estimated for 20° flexion and 10° extension of the upper body using an inverse static musculoskeletal model. These forces were subsequently transferred to a nonlinear FE model of the spino-pelvic complex, which includes 243 muscle fascicles. Deviations of body height (±10 cm), spinal orientation in the sagittal plane (±10°), and body weight (±10 kg) between both models were intentionally generated, and their influences on IVRs were determined. The changes in each factor relative to their corresponding reference value of the IS model were calculated. Deviations in body height, spinal orientation, and body weight resulted in maximum changes in the IVR of 19.2%, 26% and 4.2%, respectively, relative to T12-S1 IVR. When transferring muscle forces from an IS to a FE model, it is crucial that both models have the same spinal orientation and height. Additionally, the body weight should be equal in both models.